PMC:7784787 / 8336-8450 JSONTXT

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{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/7784787","sourcedb":"PMC","sourceid":"7784787","source_url":"https://www.ncbi.nlm.nih.gov/pmc/7784787","text":"asked dummy, (B) three-layer mask with middle filter layer removed, (C) single-layer textile mask. Bottom row: (D)","tracks":[]}